Unlocked IPhone 3G. How much?
There were many discussions about unlocked IPhone 3G. The first step is to buy the device without AT&T (or some other operator) subscribtion. There are rumors that without a contract IPhone will cost $600-$800 in the US. George Hotz in his blog says that the best way is to buy contract and cancel it. It will cost $200+$35+175=$410. Which is not bad at all.
As for the unlock software, I believe it will be avaliable quite soon.